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Diffstat (limited to 'libio')
-rw-r--r--libio/fmemopen.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/libio/fmemopen.c b/libio/fmemopen.c
index 265b848ebe..51e849e846 100644
--- a/libio/fmemopen.c
+++ b/libio/fmemopen.c
@@ -164,7 +164,7 @@ fmemopen_seek (void *cookie, _IO_off64_t *p, int w)
break;
case SEEK_END:
- np = c->size - *p;
+ np = c->maxpos - *p;
break;
default:
@@ -201,6 +201,13 @@ fmemopen (void *buf, size_t len, const char *mode)
cookie_io_functions_t iof;
fmemopen_cookie_t *c;
+ if (len == 0)
+ {
+ einval:
+ __set_errno (EINVAL);
+ return NULL;
+ }
+
c = (fmemopen_cookie_t *) malloc (sizeof (fmemopen_cookie_t));
if (c == NULL)
return NULL;
@@ -218,7 +225,12 @@ fmemopen (void *buf, size_t len, const char *mode)
c->buffer[0] = '\0';
}
else
- c->buffer = buf;
+ {
+ if ((uintptr_t) len > -(uintptr_t) buf)
+ goto einval;
+
+ c->buffer = buf;
+ }
c->size = len;